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I had thought of going with a performer package. I was also wondering, to boost my CR, could it be possible to place the heads off the 71 350 that I have onto the 455? What are the disadvantages/advantages to doing this?
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I have done it, but it takes A LOT of port grinding to match the runners CORRECTLY. You must also put the larger valves into the SB heads (of course).
Just get the right pistons...